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25i to 50p

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Xana Raquel
25i to 50p
on Oct 26, 2014 at 12:52:10 pm

Hi,

So basically I have an old DV camera that shoots in DV PAL at 25i. I want to convert the footage to 50p so it won't lose the smoothness and doesn't have the interlace artifacts.

I can't figure out what project's settings do I need in Sony Vegas in order to do this.

I think I did this some years ago but I can't figure it out how I did it in Sony Vegas... (maybe I used AviSynth with it)


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Graham Bernard
Re: 25i to 50p
on Oct 26, 2014 at 1:52:09 pm

Where are you showing this 50p output?

G

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Xana Raquel
Re: 25i to 50p
on Oct 26, 2014 at 3:15:54 pm

On computers only. I have no intentions on showing it on a TV.


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Mike Kujbida
Re: 25i to 50p
on Oct 26, 2014 at 3:17:15 pm

What version of Vegas are you using?


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Xana Raquel
Re: 25i to 50p
on Oct 26, 2014 at 3:43:11 pm

Sony Vegas Pro 12


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mark thompson
Re: 25i to 50p
on Oct 26, 2014 at 5:26:27 pm

Xana,
did you get the numbers the wrong way round? i.e. what you are after is 50i to 25p?

If so what you need to do is de-interlace, otherwise ignore the following :-)

On the file/project properties, make sure they match your media - use the Match Media Video Settings (top right corner).

Select a de-interlace method. You get choice of Blend Fields/Interpolated fields. I would try both to see which gives best results. The other option is to get yadif for vegas:
http://www.yohng.com/software/yadifvegas.html
That is supposed to produce good results.


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Graham Bernard
Re: 25i to 50p
on Oct 26, 2014 at 5:43:43 pm

[mark thompson] "i.e. what you are after is 50i to 25p?"
Mark, I just took the request at face value . . . And I should not have. So what the ORIGINAL is, is 50i running at 25fps INTERLACE. What is wanted is 25fps PROGRESSIVE - De-Interlaced.

Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Xana Raquel
Re: 25i to 50p
on Oct 26, 2014 at 6:18:48 pm
Last Edited By Xana Raquel on Oct 26, 2014 at 6:19:30 pm

Correct me if I'm wrong on this part:
My old DV camera shoots in DV PAL (720x576 without aspect ratio) at 25 fps interlaced. So it's 25i right?

Either way, I want it to be 50 fps progressive (de-interlaced). I can do it easily in VirtualDub using the deinterlace filter with Yadif algorithm and "double frame rate" selected and it looks really nice and smooth. Just like it would if I watched the tape with the camera connected to the TV.
I want to do something like that on Vegas but I can't. Whatever frame rate or field order I choose it will never "double" the frame rate of the footage, making that it always lose the smoothness.

If I don't find any solution I'll just have to process all the footage with VirtualDub first. I was trying to avoid it since I'll need a lot of free space for that.
Maybe that's how I did it in the past...


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mark thompson
Re: 25i to 50p
on Oct 26, 2014 at 11:10:57 pm

Xana,
the DV camera probably shoots 50i, 50 interlaced fields per sec giving the equivalent 25 full frames per second. It should easily convert to 25p (25 progressive frames per sec. Other regimes are possible, for specialist cameras, but that is what to expect from most DV PAL.

Look at the Sony AVC/MVC Internet templates. You will have to customize one to get what you want.

I wouldn't be expecting great things because, at the end of the day, it is still SD footage.

cheers
mark


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